A Medicare Supplement Insurance (Medigap) policy is health insurance that can help pay some of the health care costs that Original Medicare doesn’t cover, like coinsurance, copayments, or deductibles. Private insurance companies sell Medigap policies. Some Medigap policies also cover certain benefits Original Medicare doesn’t cover, like emergency foreign travel expenses. Have Medicare questions? Where you are new to Medicare or already have Medicare, let's talk. What are the